Mat and Silk Paint Advice Please

I have had a look at the other posting and could not find any similar postings which cover my specific questions below.

Question 1
I was talking to an individual recently and he told me I was wrong to paint my ceiling with a silk finish and that they should be Matt...is this true....I have always for years painted my ceiling white silk.

Question 2
He also said to me that he adds water to his Matt paint, I was told it made the rollering easier.....concentrated matt emulsion straight from the pot was hard work when rollering all day!!......I argued that ...would it not make the paint less opaque diluting it? What's the truth?

Question 3
Is there a rule of thumb wether you use matt, silk or satin?

Any other relatied comments would be appreciated.

Thanks in advance for any answers to the above.

the way i see it is: (but im not a pro)

1) matt covers dents etc better and doesnt sheene so is best for ceilings.

2) i water down the first coat but not the second (read the tin!)

3) matt: ceilings and areas that arent prone to getting dirty, walls that arent perfect as it hides a lot.

satin: areas likely to get dirty, eg kids handprints on wall (satin doesnt get dirty as easily and is easier to clean, but doesnt look as good and highlights inperfections). also i feel that its better suited to bathrooms and kitchens (less prone to water ingress?), although you can get special bathroom/ kitchen paint it cost more -i expect people may differ with me on that one.

I meant to mention the other comment was that there is now a "Wipeable" Matt finish on the market...which overcomes the disadvantages of earlier Matts which marked easily....true or false?

Thanks

About the most wipeable matt is Dulux Diamond Matt, claims to be ten times tougher than ordinary matt.

danennis60, thanks for your comment.